A ball moves horizontally in a closed box making several collisions with the walls. The box is kept on a smooth horizontal surface. During the motion of the ball, the velocity of the center of mass :
A
of the box remains constant.
No worries! Weāve got your back. Try BYJUāS free classes today!
B
of the box plus the ball system remains constant.
Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses
C
of the ball remains constant.
No worries! Weāve got your back. Try BYJUāS free classes today!
D
of the ball relative to the box remains constant.
No worries! Weāve got your back. Try BYJUāS free classes today!
Open in App
Solution
The correct option is B of the box plus the ball system remains constant. Consider your system as the box + ball. All forces acting on the system are internal (equal and opposite) i.e. net force acting on the system is zero. i.e. the velocity of center of mass remains constant.